<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        #click{
            width: 100px;
            position: absolute;
            top: 20x;
            left: 20px;
            z-index: 1;
        }
        #hidden{
            height: 50px;
            width: 120px;
            position: absolute;
            opacity: 0;
            z-index: 2;
        }
    </style>
</head>
<body>
    
    <input id="click" value="click me" type="button" onclick="console.log('click')">
    <iframe src="./inner.html" scrolling="none" id="hidden"></iframe>
</body>
</html>